Fixing concat call

There is an error running puppet on client:

    Error: Failed to apply catalog: Could not find dependent Exec[concat_/etc/make.conf.local] for File[/_etc_make.conf.local/fragments/10_pkgng in make.conf.local]

Adding fix based on https://groups.google.com/d/msg/puppet-users/vqEt5fobTDw/qQcsMcdO2-MJ